GPIO Labs 915 MHz Bandpass Filter (Green)

GPIO Labs | Part: UNKNOWN

Tiny bandpass filter with ~40MHz passband and 2 SMA connectors

Comments from the Austin Mesh Community

These are fine for low powered nodes, but we've burned multiple out trying to run them above 22dbm. Generally the WeHooper is a better option. I think the red and green are actually the same, but I don't remember where or how I got these, so I cannot verify.

Specs

Brand

GPIO Labs

Part Number

UNKNOWN

Filter Type

Bandpass

Connectors

2x SMA Female

Loss at Meshtastic (906.875 MHz)

2.36 dB

Loss at MeshCore (910.525 MHz)

2.17 dB

Return Loss at Meshtastic

25.9 dB

Return Loss at MeshCore

32.2 dB

3 dB Passband

895.9-936.1 MHz (40.3 MHz)

Dimensions

44 x 18 x 7 mm

Test Results

This page collects 2-port VNA measurements of one unit of the GPIO Labs 915 MHz Bandpass Filter (Green), measured firsthand by the mesh community (KG5HZC). Every sweep is charted below and downloadable as a Touchstone (.s2p) file. Measured 3 dB passband is 895.9-936.1 MHz (40.3 MHz wide).

Test 1 (KG5HZC)

At Mesh Operating Frequencies

Meshtastic (906.875 MHz)

Loss: 2.36 dB

Return loss: 25.9 dB

MeshCore (910.525 MHz)

Loss: 2.17 dB

Return loss: 32.2 dB

3 dB passband: 895.9-936.1 MHz (40.3 MHz wide), minimum loss 1.84 dB at 917.3 MHz.

Out-of-Band Rejection

433 MHz (70cm ham / ISM)47.2 dB

700 MHz (LTE 700)49.5 dB

824 MHz (Cellular uplink)45.3 dB

894 MHz (Cellular downlink)7.8 dB

930 MHz (Pagers)2.2 dB

960 MHz (Fixed links)36.9 dB

1090 MHz (ADS-B)42.9 dB

Notes from test

No notes available

Tested By

Tommy Ekstrand, KG5HZC on 2026-07-11

Download .s2p (902-928 MHz, 101 points)Download .s2p (885-970 MHz, 101 points)Download .s2p (430-1500 MHz, 101 points)

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